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MSD 6A Digital Ignition Module (79-95 All)

Item 14221
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • A Stronger Spark Equals More Power
      • Higher Output with 530 Primary Volts and 135mJ of Spark Energy
      • More Efficient, Uses Less Current to Produce More Power
      • New Lower Profile Housing
      • Built-In LED for System Checks
      • Fits All Mustangs with a 12-15 Volt Electrical System


      Capacitive Discharge. The MSD 6A Digital Ignition features a capacitor which is quickly charged (within one millisecond) to 520-535 volts and stores it until the ignition is triggered. With the Capacitive Discharge design, the voltage sent to the coil is always at full power even at high rpms unlike conventional stock inductive ignitions which requires the coil to store and step up the voltage in between each firing which can result in a loss of power or top end miss.

      More Efficient. Inside the Digital 6A you'll find a high speed RISC micro-controller that constantly monitors and controls every firing. The circuitry has been updated with highly efficient components that help the ignition produce more power while drawing less current. The new Digital 6A delivers well over 530 volts to the coil with up to 135mJ of spark energy for every firing. Increased output combined with MSD's proven multiple spark series is a winning combination.

      Multiple Sparks. The MSD 6A produces full power multiple sparks for each firing of a plug. The number of multiple sparks decrease as your rpm's increase, however the spark series always lasts for 20° of crankshaft rotation. For rpm's above 3,000 there is simply not enough "time" to fire the spark plug multiple times, so there is only one powerful spark.

      Application. The MSD 6A Digital Ignition Module will work on all Mustangs that are equipped with a 12-15 volt electrical system, including 4, 6 or 8-cylinder engines.

      Operating Specifications
      • Spark Energy: 135-145 mJ per spark
      • Primary Voltage: 520-540 Volts
      • Secondary Voltage: 45,000 Volts
      • Spark Series Duration: 20 degree Crankshaft Rotation
      • RPM Range: 15,000 RPM with 14.4 Volts
      • Voltage Required: 12-15 Volts, 7 volt start
      • Current Draw: 0.7 Amp per 1,000 RPM
      • Weight/Size: 1.7 lbs. 8"L x 4"W x 1.825"H

      Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 Details

      MPN# 6201

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (16)

      Write a Review

      Ratings Summary

      4.4 out of 5 overall rating from 16 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • October 01, 2019

        5 1988 LX - BranceGrace Installation Time: Shop Install Installation Cost: $100-$250

        MSD 6A D.I.M

        Works great! I got a great performance gain and spark output from this.

        Helpful (0)
      • September 24, 2018

        4 1990 GT - Danny Installation Time: Less than 1 Hour


        Fast shipping And easy to install ! Runs amazing

        Helpful (3)
      • July 20, 2018

        1 1992 LX - BrandonO Installation Time: Less than 1 Hour

        Not worth it

        I installed this on my 94 f250 and also had one on my 92 foxbody. both never lasted more then a few months before they caused a miss or just shutdown altogether.

        Helpful (6)
      • June 02, 2017

        3 1991 LX - Dannyleech Installation Time: Afternoon

        time to install

        had to make a place for it made a bracket on rad. took some time but looks good i have not had a chance to see what if any change was made to my car.

        Helpful (5)
      • January 11, 2017

        5 1991 LX - Jay


        Has the same footprint as the original but not as tall. This makes the unit compact for installation under my BBK cold air kit.

        Helpful (5)
      • October 04, 2015

        4 1994 GT - drunknmunky Installation Time: Less than 1 Hour

        looks good

        Works good noticed a difference and if u don't have one u should get one lol

        Helpful (7)
      • August 27, 2015

        5 1993 Cobra - Tdavis Installation Time: Less than 1 Hour

        Great product

        very easy install. Harness was a direct plug in no issues.

        Helpful (6)
      • May 19, 2014

        5 1994 Cobra - NHRA40 Installation Time: Afternoon

        Great Product

        I installed the MSD 6A on my 94 Mustang Cobra using the MSD-8874 wiring Harness and it made it a snap to hook up. It took longer to relocate the battery in the truck than to mount and hook up the MSD 6A box.

        Helpful (6)
      • May 13, 2014

        5 2014 V6 - Stratton

        MSD Ignition

        Are you looking for top class products for your car’s performance? Edelbrock super chargers are the perfect destination for you providing edelbrock products, charger and also sells top most brand products.

        Helpful (7)
      • January 24, 2014

        5 1994 GT - Lukester Installation Time: Less than 1 Hour

        Awesome product!

        My brother in law and I bolted and wired this to my 94 GT in less than an hour. It not only improved overall performance and reaction time, but completed the under the hood look... I have red plug wires, msd coil, msd cap and rotor as well, so just looks complete now! Great buy!

        Helpful (11)

      Questions & Answers (8 answers)

      5 Top Rated Questions

      Will this work on a carbonated 1984 mustang, replacing the replacing it for the adjustable timing ignition control?

      My 90 mustang gt has msd street fire distributor and coil and plugs and wires.since I've put it on I've had missing problems and it falls on its face if I punch it.what to do

      • Please contact us at 1 (888) 318-4347 or, and one of our representatives will be happy to assist you.

      Helpful (0)

      My 90 mustang gt has msd street fire distributor and coil and plugs and wires.since I've put it on I've had missing problems and it falls on its face if I punch it.what to do

      • Please contact us at 1 (888) 318-4347 or, and one of our representatives will be happy to assist you.

      Helpful (0)

      Can you set a rev limiter with this box ?

      • No you cannot.

      Helpful (0)

      I have been told, the MSD Ignition Boxes, will not work with the Factory Tachometer ....

      • The 6A and 6AL will work with most Mustang tachs, however some years will not properly work without an adapter. Without knowing the year of your Mustang, we would be unable to assist.

      Helpful (0)
      Post Your Question
      3 More Questions
      im changing heads, cam and intake manifold will this MSD ignition get rid of the stock rev limiter cause it taps out at 5400 rpm.? 1 answer
      Will this work with a stock distributor? Would it be ok to use this with a stock distributor? I have a foxbody with an MSD ignition coil, stock distributor, and Ford Racing 9mm spark plug wires if it makes any difference. 1 answer
      does it work with ignition controll moduale I have read all instructions and all diagrams have single coil not coil pack not sure how would hook up to ignotio control modual 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Digital Ignition Module
      • (2) Wiring Harnesses

      Tech Specs

      Will It Fit My Mustang

      • Cobra - 93, 94, 95
      • Cobra R - 93, 95
      • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Other - 79, 80, 81, 82, 83, 84, 85, 86
      • V6 - 94, 95

      Fits Mustangs equipped with a 12-15 volt electrical system

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